Filament-winding machine



c. E ISLER.

' FILAMENT WINDING MACHINE.

APPLICATION FlLED DEC.29, I914.

Y Patented Apr. 27, 1920..

4 SHEET$SHEET 1- I "I llil l l rlllll llllll m INVENTOR hzzfld/m ATTORNEY C. EISLER.

FILAMENT WINDING MACHINE.

APPLICATION FILED DEC.29, 191% 1,838,498. e Apr- 27,1920.

4 SHEETS-SHEET 2.

WITNESSES INVENTOR C/zarles Easier.

I AT-IZORN EY C. EISLER.

FILAMENT WINDING MACHINE.

APPLICATION FILED DEC.29, 1914.

Patented Apr. 27, 1920.

4 SHEETS-SHEET 3.

INVENTOR 'C/zazries Eisler'.

, WITNESSES ATTORNEY C. E|SLER..

FILAMENT WINDING MACHINE.

APPLIICATION FILED 056.29, 1914.

Patented Apr. 27, 1920.

4 SHEETSSHEET 4.

INVENTOR C/zardes Ez sZer ATTORNEY WITNESSES UNITED STATES PATENT OFFICE.

CHARLES EISLER, 0F BLOOMFIELD, NEW JERSEY, ASSIGNOR TO WESTINGHOUSE LAM COMPANY, A CORPORATION OF PENNSYLVANIA.

FILAMENT-WINDING MACHINE.

Specification of Letters Patent.

Application filed December 29, 1914. Serial No. 879,483,

To all whom it may concern:

Be it known that 1, CHARLES EIsLnR, a citizen of the United States, and a res1dent of Bloomfield, in the countyof Essex and chines, and it has special reference to ma-- chines for making helical metallic filaments for incandescent electric lamps.

The object of my invention is to provide an automatically-operated machine of the character indicated above which shall be simple in construction and eilicient in operation, and which shall be adapted to form helical filaments of widely varying dimensions and characteristics.

More particularly, my invention has for its object to provide a machine for automatically and continuously winding helical filaments of the type which is composed of a series of sections of closely-wound turns of wire separated 'by one or more turns of greater pitch than-the turns composing the closely wound sections, and which is provided, at its ends, with loosely wound sections for attaching the filament to the leading-in wires of an incandescent lamp.

Of the accompanying drawings, Figure 1 is a perspective view showing a machine constructed in accordance with my invention; Fig. 2 is a front elevational view of the machine shown in Fig. 1; Fig. 3 is a side elevational view of the same machine as seen from the left of Fig. 2; Fig. 4.- is a front elevational view of a modified form of winding disk; Fig. 5 is a side elevational view of the upper portion of the machine as seen In certain types of incandescent electric lamps, it is desirable to provide the filament in the form of a helix of wire, audit is customary to divide this'helix into two or of straight or loosely-wound wire, the filament being attached, at some or all of these intervals,-to its supports. Such sectional filaments have heretofore been made by winding a wire that is to compose one or more filaments around a mandrel wire of copper or 'steel in a continuous coil, dissolving themandrel wire by means of a suitable acid, and thereafter forming the loosely-wound spacing sections or breaks Patented Apr. 27, 1 920.

.more sections separated by a short interval i at proper intervals by manually opening up the coil by the insertion of a hot wire or blade. Obviously, this method of forming the spacing sections produces filaments that are only approximately correct in the lengths of their sections and in the extent to-which the coil.'is untwistedat the spacing intervals. A further disadvantage of the process heretofore in use is that the total length of twisted filaments that can be formed in a single operation is limited by the length of the mandrel wire which can be used with hitherto-existing machines. In practice, this limiting length has been found to be about two feet.

According to my present invention, I provide :a machine for automatically accomplishing all of the results described above and having the additional advantages that the several kinds .of turns which make up a single filament are formed with much greater accuracy than has heretofore been possible, and that continuous supplies of mandrel wire and filament wire are used, so that many yards of filament can be accurately wound without stopping the machine or giving it any attention. Furthermore, I provide the machine with various adjustments, whereby the characteristics of the wound filaments may be varied at will with respect to the pitch of the filament helix, its diameter, the total number of turns in each filament, the number of turns in each section of the filament and the number of sections that compose each filament. In general, my winding machine consists "of a support carrying a spool of mandrel wire, a drum for drawing the mandrel wire from the spool and for receiving the mandrel wire after the filament wire has been wound upon it, and a rotating device interposed between the spool and the drum for causing a supply of filament wire to rotate rapidly around the mandrel wire while the mandrel wire is being drawn without rotation from the spool to the drum and. for

thereby coiling the filament wire upon it.

The winding drum is positively rotated in order to draw the mandrel wire past the' rotating winding device," and the speed of rotation of the drum is periodically increased for a moment by means of a cam driving the various elements of the machine I -tion may be formed in the coil.

device, in order to form one-or two looselywound-turns that constitute a break between two adjacent sections; Atgreate'r intervals,corresponding to the total length of each filament, the speed of the drum is automatically increased-for a longer period, in order that a coarsely-wound terminal sec- A further feature of my machine is. a novel device for electrically heating the filament wire while it is being wound upon the mandrel wire, such heating bemg' necessary in order' to soften the filament and to thereby prevent it from breaking during the winding opera. tion. v w T' For a better understanding of my invention reference may now be had to of the accompanying drawing-which shows a device in which a'supply of mandrel wire 1 is drawn horizontally from a spool 2,

passes through a tensioning device 3, then lengthwise. through a guiding quill tube 4,

then axially through a central opening 5 in a rotating winding plate or disk 6, and

finally is wound upon a. power-driven drum 7. The opening 5 may be provided-by a drilled jewel centrally held in the plate 6.

A supply of'filament wire 8 is carried by a metallic spool 9, which is secured 'to the rotating plate 6 near its periphery, and the filament wire is guided to the mandrel wire 1 by means of a flier device 10. Power for is derived from a motor 11, or other suitable prime mover, through a belt '12and a pulley wheel 13 which is secured to one end of-a main power shaft 14 that is supported in bearings 15, 16, 17 and 18 secured to outa countershaft .27 that is supported in brackets under the table 25. Sets of cone pulleys 28 are secured to the countershaft 27 and to the armature shaft of the motor 11, and are connected by means of a belt 29.

' Proceeding to amore detailed description of the machine, the spool 2, which carries the supply of mandrel wire, issupported on the table 25 by means of a standard 30 and a vertically adjustable support 31, which extends through a bearing 32 in the standard 30'and is maintained in its adjusted'post tion by means of a set screw 33.

tionary and the upper member 37 being verv tically movable toward and from the mem ber 36 and being pressed toward the mem ber 36by means of afconi-pression spring- 38 surrounding a rod "which supports the pressure member 37. The rod; 39 passes loosely through a supporting bracket 40 and is provided, at its outer end, with screwthreads upon which are-mounted a nut- 41 and a milled lock nut 42. By manipulating-so the nuts 41 and 42, the pressure which thetoothed member 37 exerts upon the wire 1 may bereadily adjusted. If desired, small strips of filer or other friction materialmay be interposed between the members 36 and '55 37 to increase the-. friction between these members and the wire 1. f The bracket 40'is supported upon oneend. of the quill tube 4, which is itself supported by a rod 43 that isvertically adjustable in a bearing 44 secured to one end of "a horizontal rod 45 which is adjustably held, by means of a set screw 46, in a bearing-47 rigidly attached to the upper end of the arm 22 of the frame23. j After leaving the guiding quill tube 4,

the mandrel wire is drawn centrally through the rotating winding disk 6, by means.of which the filament wire is woundfupon it.' The disk 6is secured to a spur gear wheel 50 by means of screws 51, a disk'52 of fiber or other electrical insulating material being interposed. between the disk 6 and the-gear wheel 50 for-the purposeof electrically insulating the plate 6 from the remainder 0f.105 the machine. Some of the screws 51 extendfrom the disk- 6 into the insulating disk 52, while other screws 51 extend from the gear wheel 50 into the disk 52, the screws in the two sets being displaced from one another to prevent electrical connection between the disk 6 and "the. gear wheel 50." The gear wheel 50 is mounted on a short shaft 56 that is 'supported in a bearing 53 disposed at the upper end of a bracket arm 54 which is bolted to the bearing 17, and the gear wheel 50 isdriven by means of a spur gear wheel 55 keyed to the main power shaft 14:. The flier member 10, which also supports the spool 9, is secured to one side of the plate 6 by means of screws 57, and diametrically opposite to the flier member is a counterweight or balancing'segment 58 similarly attached to the plate 6 by means of screws 59. The metal spool 9 is rotatably mounted on a pin 60 that is secured to the flier member 10, and a screw 61 maintains the spool 9 in position on the pin 60 against the action of a compression spring 62.

The flier member 10 is flattened, at its substitute, for the metal spool 9, an ordinary outerend, as shown at 63, and to this flattened end portion is removably attached, by means of a screw 64, a jewel-carrying plate which contains a drilled diamond or other jewel through which the filament wire is guided to the mandrel wire. I provide several jewel-carrying plates, the jewels in which are properly drilled to receive standard sizes of filament wire. The use of drilled jewels is dispensed with in the winding of very small filament wire, since it is a tedious operation to insert the end of a very fine filament wire in a smallopening. In winding wire of very large diameter the use of jewels is likewise omitted, as a larger wire may be passed through the plain open; ings in the plate 65 than could be passed through a jewel supported. in the manner described above. In these cases, the filament wire is guided through plain openings in the plate 65.

In order to heat the filament wire while it is being wound upon the mandrel Wire, electric current is supplied to the circular plate 6, the periphery of which is madesmooth to act as a slip ring and is engaged by a brush 70, shown in Figs. 3 and 5, which is held in a brush holder 71 supported on the bracket arm 54 and is pressed toward the periphery of the disk 6 by means of a spring 72 which is compressed by means of a screw 7 2. Current is supplied to the brush through a conductor 73, Fig. 2,

' and is controlled by a switch 74 and a rheostat 7 5. The conductor 73 is energizedfrom any convenient source, which may be the low-tension side of a transformer 76 that receives current from a lighting circuit or any other suitable source of power. Current entering the disk 6 fromthe brush 70 is prevented from passing to the gear wheel 50 by the insulating disk 52 but passes readily to the metal spool .9: and to the filament wire wound thereon and thence to the mandrel wire through the portion of the filament wire that is being-wound. The circuit is completed from the mandrel wire through the frame of the machine and a conductor 7 8, which may conveniently be attached to a bolt 77. On account of the small diameter of the portion of the wire 8 which carries the current from the spool 9 to the mandrel wire l, this portion of the wire 8 is highly heated at the instant of winding, the exact degree of such heat being controlled by means of the rheostat 75. I have found that a cherry-red 'heat isthe most suitable temperature at which to wind ordinary tungsten w1re.

In a modification of the apparatus f0 heating the wire which is shown in Fig. 4,-I

wooden spool, in which case, a metallic body, such as a pin or idler wheel is secured to the disk 6, and the filament wire is passed around this metallic body after leaving the spool and before passing through the perforated guide plate 65. Electric energy is thus supplied to the wire through the plate I ted and therefore lessened in strength and impaired in radiating efficiency. The wire has also beensometimes heated by passing it through a mercury electro'de, but harmful sparking and pitting also occur in this process.

By my heating device, in which the brush rests upon a smooth, surface similar to the slip rings of rotary electric machines, such damage to the wire is avoided, and, at the same time, the wire is highly heated only during its passage from the spool to the mandrel w1re.

The winding drum 7, which receives the "mandrel wire after the filament wire has.

been wound upon it, is supported upon a vertical shaft 80 that is slidably mounted in a bearing 8L secured in a supporting bracket 82 which is bolted to the bed plate 24. The shaft 80 extends through another bearing 83 in the bed plate 24 and is further extended beneath the base plate 24 for a purpose to be hereinafter described' Inter posed between the shaft 80 and the bearing 83, as best shown in Fig. 6, is a sleeve 84, of the form shown in this figure, which forms a bearing for the slidable shaft 80 and carries, secured to, its upper end, a bevel gear wheel 85. Resting upon the bevel gear wheel 85 is a ratchet wheel 86 that is in-..

timately secured to a sleeve 87. which surrounds the shaft 80 and is provided with keys 88 and 89 that are received in" long longitudinal keyways 90 and 91 in the shaft 80. Secured to the bevel gear wheel 85, between the ratchet wheel 86 and the teeth of the bevel gear wheel, are a series of pawls 92 that engage the teeth of the ratchet wheel 86. It will be evident that, when the bevel gear wheel 85 is caused to rotate in the proper direction, the pawls 92 and the ratchet 86 will cause .the shaft 80 to rotate at the same angular speed, but that the shaft 80 is permitted to move longitudinally with respect to the ratchet mechanism by reason of the engagement of the keys 88 and 89 in the keyways 90 and 91.

Superposed upon the ratchet wheel 86, and loosely surrounding the sleeve 87, is a plate 93, hereinafter called a pawl plate,

which carries, on its lower side, a second series ofpawls 94 that engage the teeth of the ratchet wheel 86 and are adapted to rotate the ratchet wheel, and, consequently, .the shaft 80,,in" the same direction'as the movement imparted to these parts by the pawls 92. The upper end of the sleeve 87 is providedwith screw 'threadswhich "are engaged by a nut 95, provided with a set screw 96, by means-of which the pawl plate 93 may be made to fit closel but movably upon the ratchet Wheel 86. 11 order to in- .sure that the ratchet mechanism just described shall be held rigidly in place, a sleeve 97 is disposedbetween" the upper end of the sleeve 87 and the bearing 81. The bevel gear wheel 85 is rotated continuously during the operation of the machine, and

the pawl plate 93 is oscillated so as to im part a periodical acceleration to the ratchet wheel 86. The gearing for effecting these independent movements of the bevel gear wheel 85 and the pawl plate 93 will now be described.

Power for continuously rotating the bevel gear wheel 85 is taken from the main power shaft 14, by means of aworm. 100 meshing I with a worm wheel 101wh1'ch is secured to a short shaft 102 that carries, at its outer end,-a spur gear wheel 103 meshingwith an intermediate spurgear wheel 104 that is mounted on a'pin 105 carried by an an nlarly adjustable slotted bracket 106. he

spur gear wheel 104 may be of any desired diameter, according to the speedat which it is desired to continuously rotate"'tlieclfi1m 7, and it meshes with a spur gear wheel 107.

secured to the outer end oil a shaft 108, to the inner end of which is secured a bevel pinion 109 meshing with the bevel gear wheel 85. If fine wire is to be wound, it may be preferable to substitute a worm wheel for the'bevel gear wheel 85, ;in which case, the bevel pinion 109 is replaced by a worm pinion. It will be evident from an inspection of the drawings that the trainof gearing just described serves to rotate the bevel'gear wheel 85 and the drum 7 continuously at a slow speed. I

The pawl plate 93 is provided, with an outwardly extending horizontal arm 110 that is integral with the plate 93 and is supported 'ina horizontal slot 111 in a guide. support 112,'as best shown in Fig. 1, The outer end of the lever 110 is engaged by a series of internal cam faces or teeth formed in a circular cam disk 113 that is bolted to a circular, plate 114 secured to the inner end of a short horizontal shaft 115 which is rotatably mounted in a bearing 116 formed in a standard .117 bolted to the bed plate 24. The lever "110 is pressed. toward the cam disk 113, by means of a helical springinclosed within an opening in the head of the standard 112 and maintained in compression .within the said openin by means of a screw 118. The outer end 0 the lever 110 is provided with a roller 119 which rests against the cam surface of the disk 113. i

The 'cam disk 113 is of theform shown in Figs. 5 and 7, being provided with a number of notches 120 corresponding to the number of sections that are to compose each finished filament. A deeper notch 121 is provided for the purpose of causing the formation of the coarselywound terminal sections referred to above. In'the operation of the machine, the disk 113 is caused to rotate .in a clockwise direction, as seen in" Figs. 5 and 7, and the lever 110 being yieldingly spring-pressed to the right as; described above, is engaged b one of the inclined cam faces of the isk'113 and is thereby forcedto therear, as seen'in Fig. 1, thus rotating the pawl plate 93 ina counterclockwise direction and causing the pawls wheel-86. en the rotation of thecam disk 113 brings the end of the lever 110 to one of the notches 120, it isforced quickly into such notch by the action of the spring under the influence of the spring, and, on

account ofthe greater depth of this notch 94 to drag niiyhupon the teeth of the ratchet and the less abrupt angle at which it is' formed, the pawl plate 93 will be caused to rotate at an accelerated speed which is somewhat slower than that caused by the notches 120, but which continues for a longer period. The ratchet wheel 86 and the drum' 7 will be accelerated during a corresponding period, and a coarsely wound terminal section of the filament will thereb be formed.

Power for rotating the shaft 115, which carries the plate 114 andthe cam disk 113,-

is derived from the main power shaft. 14 by means of a worm 125 meshing with a worm wheel 126 that is secured to a hori- -zontal shaft- 127, to which is also secured -a .miter gear wheel 128 meshing with ,a

mitergear wheel 129 that issecured to a longitudinally extending short shaft 130 carrying, atits outer end, a pinion 131 meshing with an intermediate spur gear wheel 132 which is mounted on a pin 133 that is adjustably' secured in an angularly adjustable slotted bracket 134. The spur pin 142 rotatably mounted in a bearing 143 formed in the lower .end of a depending bracket 144 secured to the under side of the bed plate 24 by means of bolts 145. The purpose of the heart-shaped cam 141 is to impart a'vertical movement to the shaft 80,.

' and, consequently, to the drum 7, during .which also carries the cam 141'.

the operation of the machine, whereby the successive turns of wire carried upon the drum 7 are caused to lie side by side. For

. this purpose, the heart-shaped cam is caused I to complete a half revolution while the machine is in operation a sufiicient time to deposit enough turns of completed filament upon the drum 7 to substantially cover it. In order to impart slow rotation to the cam 141, power is derived from the bevel gear wheel 85 through a worm 147 which is keyed to the sleeve 84. The worm 147 meshes with a worm wheel 148 that is secured to a shorthorizontal shaft 149, which is rotatably mounted in a bearing 150 formed in an extension of the depending bracket 144 and carries, at its outer end a spur gear wheel 151. The gear wheel 15,1

.meshes with an intermediate spur ear wheel 152 that is secured to a short s aft 153 adjustably secured in an angularly adjustable slotted bracket 154. The gear wheel 152, which is of a size corresponding to the speed at which the heart-shapedcam 141 is to be rotated, meshes with a spur gear wheel 155 that is secured to the short shaft 142 r In order to maintain the cam guide 140 firmly upon the cam 141, I provide a bar 156 that extends transversely through the cam guide 140 and supports, at its outer ends, helical springs 157, shown in Fig. 2. The lower ends ofthe springs 157 are secured to anyconvenient stationary support, and their.

- effect is to assist the force of gravity in maintaining the shaft 80. and the drum 7 yieldingly in their lowermost positions.

A'roller 158' is adapted to rest against the face of the drum 7 to assist in maintaining the filament in place thereon as it is being 'wound. The roller 158 isrotatably mounted uponza pin 158 that is secured to the outer end of an arm 159, the other end of which isrotatably secured to the upper end of a bracket arm 160 formed upon the bracket 82. A helical spring .161 surrounds the bracket arm 160, near its upper end, and

serves to press the arm 159 in the proper direction to efiect close contact between the roller 158 and the wire wound upon the drum7. The roller 158 is of special utility when fine coils are being wound. It prevents the filament-carrying mandrel from unwinding from the drum in case of a break in the mandrel wire.

The manner in which the machine op erates will be clear from the foregoing description, taken in connection with the drawing, and it will also be understood that the machine, when started, will automatically and continuously form sectional helical filaments. The total length that can be wound is limited only by the capacity of the wire carrying spools 2 and 9. It is to be particularly observed that the machine is adapted pr decreasing the speed of the winding drum, which is accomplished by, Varying the size of the gear wheels 101, 104 and 107.

. The diameter of the filament helix is varied according to the diameter of the mandrel wire selected. -The total number of turns in each filament is varied by increasing or decreasing the speed of the toothed cam disk 113, which is accomplished by changing the diameter of the gear wheel 132 mounted in the angularly adjustable slotted bracket 134.

Ordinarily, one complete revolution of the cam disk 113 corresponds to one complete filament, but, if short filaments are desired, two or more of them. may be madeduring each revolution of the cam disk 113, two or more of the deep notches 121 being provided in such case. The numberof sections in each filament is varied by altering the number of notches in the cam disk 113.- Each notch causes the formation of one of the spacing sections or breaks, and, since these notches are distributed symmetrically around the cam disk, a cam disk having a given number 'of notches will form that number of sections in each filament, no matterohow many or how few may be the n'umsix of these pawls 92, and they are spacedapart in a slightly unsymmetrical manner, the space between each pair of adjacent pawls differing from one sixth of the circumference of the ratchet wheel 86 by one sixth of the pitch of the ratchet wheel teeth. On account ofthis arrangement, it is impossible for the ratchet wheel 86 to rotate in the direction opposite to its normal direction of rotation for more than one-sixth of the tooth pitch of; the ratchet wheel .lash between the ratchet wheel and the without striking one of the pawls 92 which thereupon acts as a holding pawl. Backpawls is thereby reduced. When a sufficient amount of'filament has been wound, it is removed from the drum 7 and cut into single-filament lengths, the

mandrel wire beingthereafter dissolved out in a vertical position, in "which case there may be danger of short circuiting between adjacent turns on account of the sagging of the coils. It may therefore be advantageous to slightly spread apart the turns that are to constitute the lower part of such a vertical section in the manner illustrated in i Fig. 9, wherein the lower turns 203 are of greater pitch than the upper turns 204;.

The machine described above is capable I of numerous modifications which may be readily devised b skilled artisans without departing'from t e spirit and scope of my invention. It is therefore to be understood that my invention 'comprehendsl all such modifications and changes as fall within the scope of the appended claims.

I claim as my invention:

1. A wire. working machine comprising means for forming a filament into a nonoverlapping helix upon a non-rotating mandrel at a predetermined pitch, and means for altering the said pitch at predetermined intervals. v

2. A wire working machine comprising means for forming a' filament into a nonoverlapping, helix upon a non-rotating mandre at a predetermined pitch, and automatically-actuated means for altering the said pitch at predetermined intervals.

A wire working machine comprising means for forming a filament into a nonoverlapping helix upon a non-rotating mandrel at a predetermined pitch, and means for altering said pitch at a plurality of different predetermined intervals.

4. wire working machine comprising means for forming-a filament into a non overlapping helix upon a non-rotating mandrel at a predetermined pitch, and automatically-actuated means for altering said-pitch at a plurality of different predetermined intervals.

5. A machine for forming wire helices comprising means for moving a source of wire bodily. around a mandrel, means for moving the said mandrel longitudinally at a: predetermined rate and means for. altering ,the said rate at predetermined intervals.

6. A machine for forming Wire helices comprising means for moving a source of wire bodily around a mandrel and auto matically-actuated means for moving the said .mandrel longitudinally at a predetermined rate and for altering the said rate actuated means for altering the said rateat a plurality of different predetermined intervals.

9. A filament-winding machine comprisingmeans for drawinga filament wire from a coil and wrapping it upon anon-rotating mandrel and means for connecting the said coil and the said mandrel to a. source of electric current, whereby the said current is caused to traverse and heat the portion of the filament. wire between the said coil and the said mandrel.

10. A filament-winding machine co uprising means for moving .a coil of filament wire bodily around a mandrel and thereby winding the said wire around the said mandrel and'means for connecting the said coil and the said mandrel to a source of electric current, whereby the said current is caused to traverse and heat the portion of the filament wire between the said coil and the said mandrel.

11. A filament-winding machine comprising means for moving a coil of filament wire bodily around a mandrel and thereby winding the said wire around ,,the said mandrel, means for longitudinally moving the said mandrel and means for electrically heating the said filament wire while it is being wound around thesaid mandrel.

12. A filament-winding machine comprising means for moving a coil of filament wire bodily around a mandrel wire, means for moving the said mandrel wire longitudinally and means for connecting the said coil and the said mandrel wire to a source of electric current, whereby the said current is caused to traverse and heatthe' portion of the filamentwire between thesaid coil and the said mandrel wire.

40 i wire, a conducting support for the said whereby the said current is caused to travma 13. a A filament-winding machine comprising .a spool of electrically conducting material adapted to receive .a coil of filament wire, means for drawing the said wire from the said spool and wrapping 'it'around a non-rotating and longitudinally advancing mandrel and means for connecting the said spool and the said mandrel to a source of electric current, whereby the said current is caused to traverse and heat the part of the said filament wire between the said spool and the said mandrel.

14. A filament-winding machine comprising a spool of electrically conducting material adapted to receivea coil of filament wire, means formoving the said spool bod- "ily around a mandrel and thereby winding the said filament wire around the said mandrel, means for longitudinally advancing the said mandrel and means forconnecting the said spool and the said mandrel to a source of electric current, whereby the said current is caused to traverse and heat the part of the said filament wire between the said spool and the said mandrel.

15. A filament-winding machine comprising a spool of electrically conducting material adapted to receive a coil of filament wire, means for revolving the: said spool bodily around a mandrel wire, means for longitudinally moving the said mandrel wire and means for connecting 'the said spool and the said mandrel to a source of electric current, whereby the said current is caused to traverse and heat the part of the said filament wire between and the said mandrel. 16. A filament-winding machine compristhe said spool 'ing a spool of electrically conducting material adapted to receive a coil of filament spool, means for drawing the said filament wire from the said spool and wrapping it around a mandrel and means for connecting the said spool support and the said mandrel to a source of electric current, whereby the said current is caused to traverse and heat the part of the said filament wire between the-said spool and the said mandrel. v.

17. A filament-winding machine comprising a spool of electrically conducting maerse and heat the part of the said filament wire between the said spool and the said mandrel.

18. A filament-winding machine comprising a spool of electrically conducting material adapted to receive a coil of filament wire, a rotatable conducting disk forsupporting the said spool, a supporting plate of insulating material for the said conducting disk, a brush adapted to engage the periphery of the said rotatable conducting disk, means for rotating the said disk to carry the said spool bodily around a man-' drel and thereby winding the said filament wire around the said mandrel and means for connecting the said brush and the said mandrelv to a source of electric current,

' whereby the said current is caused to traverse and heat the part of the said filament wire between the said spool and the said mandrel.

19; A device for wrapping filamentary material around a mandrel comprising a revoluble plate provided with an axial aperture for receving a mandrel, an insulating support for the said plate'and a filamentcarrying metallic spool secured to the said 7 plate and adapted to be carried around the said mandrel when the said plate revolves.

20., A device for wrapp ng filamentary conducting material arounda mandrel comprising a revoluble plate provided with an axial aperture for receiving a mandrel, an

insulating support for the said plate, a

filament-carrying metallic spool secured to the said plate and adapted to be carried around thesaid mandrel when the said plate revolves and a brush engaging the said revoluble plate for supplying electric current thereto.

21. A device for wrapping filamentary conducting material around a mandrel comprising a revoluble plate provided with an axial aperture for receiving a mandrel, an insulating support for the said plate, a

filament-carrying metallic spool secured to the saidplate and adapted to be carried around the said mandrel when the said plate revolves and a brush engaging the periphery of the said revoluble plate for supplying electric current thereto.

" 22. A device for wrapping filamentary material around a mandrel comprising a revoluble plate provided with an axial aperture for receiving a mandrel, a metallic filament-carrying spool secured to the said plate and adapted to be carried around the said mandrel when the said plate revolves,

a balancing weight secured to the said revoluble plate diametrically opposite the said spool, and a revoluble member supporting the said plate and electrically insulated therefrom.

23. A device for. wrapping filamentary terial around a mandrel comprising a 13 n revoluble plate provided with an axial aperture for receiving a mandrel, a filamentgcarrying metallic spool secured to the said plate "and adapted to be carried around the said mandrel when the said plate re- .volves, a member for guiding the said fila- "mentary material from the said spool to the saidmandrel, and a revoluble member mentary material from the said spool to the'said' mandrehthe said guiding member comprising an arm secured to the said revoluble pla'te with its outer end adjacent to.

theaxis of the said plate and carrying at the said outer end, an apertured guide plate.

25. A device for wrapping filamentary material around a mandrel comprising a revoluble plate provided with an axial aperture for receiving a mandrel, a filamentcarrying metallic spool secured to the said plate and adapted to be carried around the said mandrel when the said plate revolves and a member for guiding the said filamentary material from the said spool to the said mandrel, thesaid guidingv member '"comprislng an arm secured to the sa1d rev oluble plate, with its outer end adjacent to the axis of the said plate andcarrying at. the said outer end a removable member provided with a drilled jewel for receiving the said filamentary material and guiding it to the said mandrel.

26. A filament-winding machine comprising means for winding a filament wire upon a non-rotating mandrel wire and means for drawing the said mandrel wire past the said filament-applying means at a predetermined and variable rate.

27. A filament-winding machine comprising means for winding a filament wire upon 'a non-rotating mandrel wire, means for V drawing the said mandrel wire. past the said filament-applying means at a predetermined rate and means for varying the said rate at predetermined intervals.

28. A filament-winding machine comprising means for winding a filament wire upon a non-rotating mandrel wire, means for.

drawing the said mandrel wire past the said filament-applying means ata predetermined rate and automatically-actuated means for varying the said rate at predetermined intervals. v

' 29. A filament winding. machine comprising means for winding a filament wire upon a non-rotating mandrel wire, a drum for drawing the said mandrel wire past the said filament-applying means at a predetermlned rate and cam-controlled means for varying the said rate at predetermined intervals.

32. A filament-winding machine comprising means for winding a filament wire around a non-rotating mandrel wire and means for drawing the said mandrel wire past the said filament-winding means, the said mandrel-drawing means comprising a drum and means for rotating'the said drum at a variable speed.

33. A filament-winding machine comprising means 'for winding a filament Wire around a non-rotating mandrel wire and means for drawing the said mandrel wire past the said filament'winding means, the said mandrel-drawing means comprising a drum and a plurality of independently operated means for rotating the said drum at predetermined speeds.

34. A filament-winding machine comprising means for winding, a filament wire around a mandrel wire, and means for drawing the said mandrel wire past the said filament-wind ng means, the said mandreldrawlng means comprlsmg a drum and a pawl-and-ratchet device for rotating a the said drum at variable speed.

, 35. A filament-winding machinecompris- .lng means for winding a filament wire around a mandrel wire, and means for drawing the said mandrel wire past the said filament-winding means, the said mandreldriving means comprising-a drum, a ratchet adapted to rotate with the said drum and a plurality of independently-operated pawl devices cooperating with the said ratchet to "rotate the said drum at variable speed' 36. A filament-winding machine comprising means for winding a filament wire around a mandrel wire and means for drawng the sald mandrel wlre past the said filament-winding means, the said mandrel- 4 drawing means comprising a drum, a ratchet adapted to'rotate with the said drum, a plurality of independently-operated pawl devices to'operate the said ratchet continuously and thereby to rotate the said drum at a predetermined rate and means for moving the other of said pawl devices intermittently and thereby to accelerate the rotation of the drum at predetermined intervals.

,37; In a wire-working machine, a winding drum, a ratchet adapted to rotate the said.

drum, a set of pawls coaxially mounted with respect to the said ratchet and adapted to engage and rotate the said ratchet, means 1,5 for revolving the said set of pawls 00111111111 ,ously at a predetermined speed, a second set of pawls also" coaxially mounted with .respect to the said .ratchet and adapted to engage and rotate the, said ratchet in the samedirectionas the said first-named set 'of pawls, and a cam device for oscillating the said last-named set of pawls and thereby accelerating the movement of the said ratchet at predetermined intervals.

drum, a ratchet adaptedto rotate the said drum, a set of pawls coaxially mounted with respect to the said ratchet and adapted to engage and rotate the said ratchet,'mean for revolving the said set'of pawls continu ously at a predetermined speed, a second set of pawls also coaxially mounted with respect tothe said ratchet and adapted to'engage androtate the saidratchet in the same direction as the said first-named set of pawls, .a support for the said last-named set of pawls and having. an arm extending 0ut- Wardly perpendicular tothe axis of revolu-.

tion of the said pawls and a rotatable cam 40 device mounted on an axis perpendicular to the axis of rotation of the said pawls and adapted to oscillate the said outwardly-extending arm and thereby to,acc elerate the movement of the said ratchet at predetermined intervals.

39. Ina wire-working machine,- a, driving ratchet, aset of pawls coaxially mounted with respect to the said ratchet and adapted -to engage and rotate the said ratchet, gearing for .revolving the said set of pawls at a selectively predetermined speed, asecond set of pawls, also coaxially mounted with respect to the saidratchet and adapted to engage and rotate the said ratchet in the same .55

direction as the said first-named set of pawls and a cam device for oscillating the said last-named set of pawls at selectively prede termined intervals.

40. In a wire-working machine, a driving ratchet, a set of pawls coaxially mounted withrespect to the said ratchet and adapted to engage and rotate the said ratchet, gearing for revolving the said set of pawls at a predetermined-speed, a second set of pawls also coaxially'mounted with respect tothe 38. In a wire-working machine, a winding" tate the said ratchet in the same direction as the said first-named set of pawls, means said ratchet and adapted to engage and r0 for yieldingly moving the said last-named set of pawls in their operative direction, a

rotatable cam device provided withla plu- :I'al'ltQUOf notches adapted to successively en gage and oscillate the said arm and to thereby accelerate the movement of the said ratchet at predetermined intervals. I 41. In a wire working machine, means for winding a wire aroundQa longitudinally movable mandrel, and means for. advancingthe said mandrel at variable speeds during predetermined time intervals, said lastm'entionedmeans comprising a driving ratchet and a set of pawls coaxially mounted with respect to the said ratchet and adapted to engage and rotate the same, the said pawls being unequally spaced around the said ratchet by a rede'terinined fraction-of the tooth pitch 0 the said ratchet.

42. In a' wire working machine, meansfor winding a Wire. around a longitudinally movable'mandrel, and means for advancing the said-mandrel at variable speedsduring predetermined time intervals, said last mentioned means comprising a driving ratchet and a set of pawls ooaxially mounted with respect to the said ratchet and adapted to en.- gage and rotate the, same, the said pawls being unequally spaced around the said ratchet by a fraction of the tooth pitch of the said-ratchet obtained by dividing the said toothpitch by the number of' said pawls. 43. A filament-winding machine comprising a support of electrically conducting material, a spool secured to the said support for receiving a coil of filament wire, means for drawing the. said wire from" the said spool and for wrapping it around a mandrel/ means for, connecting the said support and the said mandrel to a source of electric current and means for electrically connecting the said wire to'the said support after the said wire is drawn from the said spool. and before it is wound on the said mandrel.

44;. A filament-winding machine compris= filaments being set off by terminal sections composedof turns of greater pitch than the 5 turns composing the said main sections.

In testimony WhereofI have hereunto subscribed my name this 21st dayof December 1 CHARLES EISLER. Witnesses." i

ALFRED H. EDGERLEY, A. E. SNYDER. 

